Four resistances 80ohm 50 ohm 25ohm and r are connected in parallel the value of r will be
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1/Rp=1/Ra+1/Rb+1/Rc
=1/80+1/50+1/25,{take LCM}
=5+10+10/5
=25/5
R =5
=1/80+1/50+1/25,{take LCM}
=5+10+10/5
=25/5
R =5
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